Bio-Chem Zorb replacement filter cartridges are sized to fit perfectly
in the cartridge holder inside the API Superclean filter. These
cartridges are superior to other cartridges on the market and contain a
completely filled cartridge sandwiched between an excellent mechanical
cartridge is sized to fit the individual filter holder giving just
enough filtration to match the flow rate of the specific Superclean
filter it was designed for.